Accumulated Other Comprehensive Income (Summary Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 5,589
Total change in hedge fair value recorded in Other Comprehensive Income			(285)
Amounts reclassified from accumulated other comprehensive income			80
Net change related to derivatives	$ 10	$ (122)	(205)	$ (191)
Net current-period other comprehensive income (loss)			(5,172)
Balance	417		417
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			8,118
Net current-period other comprehensive income (loss)			(5,051)
Balance	3,067		3,067
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			10
Net current-period other comprehensive income (loss)			(19)
Balance	(9)		(9)
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(2,287)
Net current-period other comprehensive income (loss)			103
Balance	(2,184)		(2,184)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(252)
Total change in hedge fair value recorded in Other Comprehensive Income			(285)
Amounts reclassified from accumulated other comprehensive income			80
Net change related to derivatives			(205)
Net current-period other comprehensive income (loss)			(205)
Balance	$ (457)		$ (457)